I have a Pinpoint monitor (on it's 2nd probe). I want to check it against a liquid test kit as I'm not happy with my readings even though I just calibrated it.
I'm not totally color blind but I do have a hard time with subtle shade differences. That's why I use Salifert for nitrate, Ca
. I think their pH test kit has a color strip that is hard to read (harder than the nitrate test).
Does anyone know of a pH test kit that gives a sharp color change at different readings in the 8.0 0 8.4 range?